prolly the number 1 thing I've learned over the years is to invest in a good quality submersible heater! I've been shocked by so many HoB or crappy heaters that break,crack, or otherwise malfunction 'n shock you silly. and yeah.. wet hand.. plugging this 'r that in...I wear the same old ragged shirt or try to each time I do maitenence.. and use it to keep my hands semi dry. becuse I always lose my towel, or it gets just outta reach ect.
and yeah if you pee on a cattle or horse fence it's not gonna feel great, drunk cousin, family dare... accidentally grabbed a live fence wire more 'n a few times now.